Newbie: opening files.
Fredrik Lundh
fredrik at pythonware.com
Fri May 19 09:44:11 EDT 2000
Bart Holthuijsen wrote:
> The following error message appears:
>
> C:\Stage\xalan>python open.py
> Traceback (innermost last):
> File "open.py", line 25, in ?
> if __name__=='__main__': main()
> File "open.py", line 13, in main
> f = open('Yearend.xml','r')
> TypeError: illegal argument type for built-in operation
>
> What am I doing wrong?
from-import is a dangerous tool. don't use it unless you
know exactly what you're doing ;-)
>>> print open.__doc__
open(filename[, mode[, buffering]]) -> file object
Open a file. The mode can be 'r', 'w' or 'a' for reading (default),
writing or appending. The file will be created if it doesn't exist
when opened for writing or appending; it will be truncated when
opened for writing. Add a 'b' to the mode for binary files.
Add a '+' to the mode to allow simultaneous reading and writing.
If the buffering argument is given, 0 means unbuffered, 1 means line
buffered, and larger numbers specify the buffer size.
>>> from sys import *
>>> print open.__doc__
open(filename[, mode[, buffering]]) -> file object
Open a file. The mode can be 'r', 'w' or 'a' for reading (default),
...
>>> from os import *
>>> print open.__doc__
open(filename, flag [, mode=0777]) -> fd
Open a file (for low level IO).
(in other words, there's another 'open' function in the os
module, and since you import *everything* from that module
into your own namespace, you can no longer access the
original builtin...)
for more info on from-import (and when it's okay to use it), see:
http://www.pythonware.com/people/fredrik/fyi/fyi06.htm
</F>
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